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| Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Roll Forward] |
| SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVest |
| StockCompensation |
| Disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position. |
| Missing [Table] |
| Detail |
| [Roll Forward] |
| Not started |
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| SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVest |
| us-gaap:ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVestTableTextBlock |
| http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsStockCompensation | Machine-readable | Human-readable |
| From |
Arcrole (predicate) |
To |
| disclosures:SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVest |
rules-arcroles:disclosure-isSECType |
fro:DisclosureType |
| disclosures:SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVest |
rules-arcroles:disclosure-equivalentTextblock |
us-gaap:ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVestTableTextBlock |
| disclosures:SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceBasedUnitsVestedAndExpectedToVest |
rules-arcroles:disclosure-hasConceptArrangementPattern |
fro:RollForward |